Primary frequency modulation active online test controller for hydroelectric generating set

Abstract

The utility model discloses a hydroelectric generating set primary frequency modulation active on-line test controller comprising a control unit which is connected with a main station interaction unit, an electrical quantity acquisition unit, a speed regulator interaction unit and an operator station interaction unit. The master station interaction unit is connected with the control unit through an internal Ethernet bus, and the master station interaction unit is connected and communicated with the scheduling test master station through the Ethernet; the electrical quantity acquisition unit is connected with the control unit through a 485 bus, and the electrical quantity acquisition unit is used for acquiring unit side current and voltage signals; the speed regulator interaction unit is connected with the control unit through a 485 bus; and the operator station interaction unit is connected with the control unit through an internal Ethernet bus. The device can be matched with a dispatching test master station to complete the primary frequency modulation test function of the hydropower station unit. Monitoring the test process to ensure the safety of unit operation; the test state is fed back to the master station and the power station operator station, and closed-loop monitoring and evaluation of the test process are synchronously achieved on the dispatching side and the power station side.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of water turbine-generator unit primary frequency modulation initiative online test controller. BACKGROUND

[0002] Power grid frequency is an important factor affecting power quality, and one of the main tasks of the power system is to maintain the stability of the power grid frequency. China has abundant water resources, and hydropower accounts for a large proportion. From the perspective of hydropower plants, primary frequency modulation is an essential function to maintain the stability of the power grid frequency, and the quality of this function directly affects the safe and stable operation of the power system. In order to master the primary frequency modulation capability of power stations, many dispatchers have begun to build primary frequency modulation initiative online test systems to simulate disturbance testing for grid-connected units and verify whether the large frequency difference frequency modulation performance of the units meets the requirements of safe and stable operation of the power grid. In view of the current situation that some water turbine-generator units have poor primary frequency modulation performance or even no primary frequency modulation function, it is necessary to test the primary frequency modulation capability of the units, check the primary frequency modulation parameters, and optimize the primary frequency modulation performance indicators through online testing.

[0003] Traditional primary frequency modulation performance testing of water turbine-generator units is usually done by professional agencies through on-site testing, which is costly and inefficient, and dispatchers and power plants cannot timely and comprehensively master the primary frequency modulation capability of the units. The establishment of a primary frequency modulation initiative online test system allows testing to be carried out at any time when the unit conditions permit, automatically collects process data and evaluates, and is more flexible and accurate. The online test controller serves as a bridge between the dispatch test master station and the units, enabling control and monitoring of the units and ensuring the safety of unit operation. UTILITY MODEL CONTENT

[0004] The main purpose of the utility model is to provide a primary frequency modulation initiative online test controller for water turbine-generator units, which can cooperate with the dispatch test master station to complete the primary frequency modulation testing function of the hydropower station units. The controller has data acquisition, control, analysis, and other functions, acquires PT / CT and unit operation state related data on the electrical side, evaluates whether the unit has the conditions for initiative testing, analyzes and checks the frequency curve issued by the master station when the conditions are met to ensure the correctness of the test points, calculates and converts the test data to analog quantity form and issues it to the water turbine-generator unit governor, monitors the testing process to ensure the safety of unit operation, feeds back the testing status to the master station and power station operator station, and synchronously realizes testing process closed-loop monitoring and evaluation on the dispatch side and the power station side.

[0005] To solve the above problems, the technical scheme of the utility model is as follows:

[0006] The application discloses a kind of water turbine generator unit primary frequency modulation active online test controller, including control unit, control unit is connected with main station interaction unit, electrical quantity acquisition unit, speed regulator interaction unit and operator station interaction unit;Main station interaction unit is connected with control unit by internal Ethernet bus, and main station interaction unit is connected with dispatch test main station by Ethernet and communication;Electrical quantity acquisition unit is connected with control unit by 485 bus, and electrical quantity acquisition unit is used to acquire unit side current and voltage signal;Speed regulator interaction unit is connected with control unit by 485 bus;Operator station interaction unit is connected with control unit by internal Ethernet bus.

[0007] Main station interaction unit includes network interface module, network communication module and data analysis module connected in sequence;The network communication module and network interface module include network communication chip, interface chip, transformer and peripheral circuit;The network communication module and network interface module are used for Ethernet communication, receive the test instruction and frequency disturbance file issued by test main station and send the state of substation to main station.

[0008] The data analysis module is composed of ARM and peripheral circuit, and is used for analyzing the instruction and file issued by test main station, extracting disturbance frequency data and transmitting to control unit, and packaging and encapsulating the state data sent by control unit to main station.

[0009] The electrical quantity acquisition unit is used for acquiring PC / CT signal on unit side, and converts AC current and voltage signal into digital signal and transmits to control unit.

[0010] The control unit includes state monitoring module, data calculation module and data storage module, and the state monitoring module includes ARM and peripheral circuit, and is connected with speed regulator interaction unit by 485 bus.

[0011] The data calculation module includes DSP and peripheral circuit, and is connected with main station interaction unit and electrical acquisition unit by Ethernet bus and 485 bus.

[0012] The speed regulator interaction unit includes data aggregation module, and the data aggregation module is connected with on-off quantity processing module and analog quantity processing module;The data aggregation module includes ARM and peripheral circuit, and is used for processing and packaging speed regulator interaction data.

[0013] The application has the beneficial effects that:

[0014] The controller realizes active online test of primary frequency modulation of hydroelectric generating set, and provides a means for effectively evaluating the primary frequency modulation capacity of the hydroelectric station. The controller can interact with the master station according to a predetermined communication protocol, receives and analyzes analog frequency instructions of the master station, and sends the test to the generating set after calculation and conversion; monitors the state of the generating set to ensure the safety of the test; and feeds back the test state to the master station and the operator station of the power station, so that the test process is monitored and evaluated synchronously at the dispatching side and the power station side BRIEF DESCRIPTION OF DRAWINGS

[0015] The utility model makes further description in combination with the drawings:

[0016] Fig. 1 It is the hardware architecture schematic diagram of the utility model,

[0017] Fig. 2 It is the hardware architecture schematic diagram of the master station interaction unit of the utility model,

[0018] Fig. 3 It is the hardware architecture schematic diagram of the control unit of the utility model,

[0019] Fig. 4 It is the hardware architecture schematic diagram of the governor interaction unit of the utility model.

[0020] In the drawing: master station interaction unit 1, electrical quantity acquisition unit 2, control unit 3, governor interaction unit 4, operator station interaction unit 5. DETAILED DESCRIPTION

[0021] The technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.

[0022] The specific working mode of the active online test controller of primary frequency modulation of hydroelectric generating set is as follows: as shown in Figs. 1 to 4

[0023] ​The controller comprises a master station interaction unit 1, an electrical quantity acquisition unit 2, a control unit 3, a governor interaction unit 4 and an operator station interaction unit 5. The master station interaction unit 1 interacts with a dispatching test master station through Ethernet, and the master station interaction unit 1 is connected with the control unit 3 through an internal Ethernet bus. The electrical quantity acquisition unit 2 acquires unit-side current and voltage signals, and is connected with the control unit 3 through a 485 bus. The governor interaction unit 4 interacts with a unit governor through analog quantity and switching quantity, and is connected with the control unit 3 through a 485 bus. The operator station interaction unit 5 interacts with a power station-side operator station through Ethernet, and is connected with the control unit 3 through an internal Ethernet bus.

[0024] When the unit is in normal operation, the governor interaction unit 4 of the controller acquires state information and key operating parameters of the unit governor through a switching quantity processing module and an analog quantity processing module, processes and packs the information and parameters through a data aggregation module, and transmits the information and parameters to the control unit 3 through a 485 bus. The state monitoring module of the control unit 3 acquires state information of each module of the controller, combines the state information of the governor, judges whether the unit has the condition for primary frequency modulation line test through logical operation, and transmits the result to the test master station through the master station interaction unit 1.

[0025] When the unit has the condition for online test, the test master station can start the test at any time by issuing a test instruction and a frequency disturbance file, so as to timely master the frequency modulation capacity of the unit. The master station interaction unit 1 of the controller comprises a network interface module, a network communication module and a data analysis module. The network communication module and the network interface module are composed of a network communication chip, an interface chip, a transformer and peripheral circuits, realize 100M Ethernet communication function, receive the test instruction and the frequency disturbance file issued by the test master station. The data analysis module is composed of an ARM and peripheral circuits, analyzes the instruction and the file issued by the test master station according to a predetermined protocol, checks the file data, and if the data are correct, extracts the disturbance frequency data and transmits the data to the control unit 3.

[0026] Synchronously, the electrical quantity acquisition unit 2 of the controller acquires PC / CT signals of the unit side, converts the alternating current and voltage signals into digital signals through a signal conversion, filtering and analog-digital conversion circuit, and transmits the signals to the control unit 3.

[0027] The control unit 3 comprises a state monitoring module, a data calculation module and a data storage module. The data calculation module is composed of a DSP and peripheral circuits, and is connected with the master station interaction unit 1 and the electrical acquisition unit through an Ethernet bus and a 485 bus. After the test is started, the power value that the unit needs to adjust is calculated according to the test instruction and the frequency disturbance file issued by the master station and the power value of the unit side. The data storage module is composed of a readable and writable storage device, is connected with the data calculation module, and acquires and stores test process data.

[0028] The control unit 3 is connected with the speed regulator interaction unit 4 through the 485 bus, and test instructions and calculated power values required for adjustment of the unit are transmitted. The speed regulator interaction unit 4 comprises a switching value processing module, an analog value processing module and a data aggregation module. The switching value processing module processes 24V input and output signals interacting with the speed regulator. The input signal is transmitted to the data aggregation module through a voltage reduction, isolation and signal shaping circuit. The output signal is output from the data aggregation module and is output through an isolation and driving circuit. The isolation circuit realizes electrical isolation between the input and output signals, and the shaping circuit filters noise and burrs to ensure the stability and reliability of the signal. The analog value processing module processes 4-20mA input and output signals interacting with the speed regulator. The input signal is transmitted to the data aggregation module through a current / voltage conversion, filtering and analog / digital conversion circuit. The output signal is output from the data aggregation module and is output through a digital / analog conversion and voltage / current conversion circuit. The data aggregation module is composed of an ARM and peripheral circuits, and processes and packages the data interacting with the speed regulator.

[0029] Synchronously, the control unit 3 feeds back test process data to the test master station and the power station operator station, and realizes test process closed-loop monitoring, evaluation analysis and historical query functions on the dispatching side and the power station side.

[0030] The operator station interaction unit 5 comprises a network interface module, a network communication module and a data processing module. The network communication module and the network interface module are composed of a network communication chip, an interface chip, a transformer and peripheral circuits, realize 100M Ethernet communication function, and interact with the operator station on the power station side. The data processing module is composed of an ARM and peripheral circuits, packages and encapsulates test process data transmitted to the operator station on the power station side, and generates a wave recording file.

[0031] Based on the above process, the controller cooperates with the dispatching test master station to complete the primary frequency modulation test of the hydropower station unit.

[0032] The content described in the embodiments of the specification is only a list of implementation forms of the utility model concept, and the protection scope of the utility model should not be regarded as limited to the specific forms stated in the embodiments. The protection scope of the utility model also extends to equivalent technical means that can be thought of by those skilled in the art according to the utility model concept.

Claims

1. A hydroelectric generating unit primary frequency regulation active online test controller, characterized in that: The control unit is connected with a master station interaction unit, an electrical quantity acquisition unit, a speed regulator interaction unit and an operator station interaction unit; the master station interaction unit is connected with the control unit through an internal Ethernet bus, and the master station interaction unit is connected with a dispatching test master station through Ethernet for communication; The electrical quantity acquisition unit is connected with the control unit through a 485 bus, and is used for acquiring unit-side current and voltage signals; the speed regulator interaction unit is connected with the control unit through the 485 bus; and the operator station interaction unit is connected with the control unit through the internal Ethernet bus.

2. The active on-line test controller for primary frequency modulation of a hydroelectric generating unit according to claim 1, characterized in that: The master station interaction unit comprises a network interface module, a network communication module and a data analysis module connected in sequence; the network communication module and the network interface module comprise a network communication chip, an interface chip, a transformer and a peripheral circuit; the network communication module and the network interface module are used for Ethernet communication, receiving a test instruction and a frequency disturbance file issued by a test master station and uploading a substation state to the master station.

3. The active on-line test controller for primary frequency regulation of a hydroelectric generating unit of claim 2, wherein: The data analysis module is composed of an ARM and a peripheral circuit, and is used for analyzing the instruction and the file issued by the test master station, extracting disturbance frequency data and transmitting the disturbance frequency data to the control unit, and packaging and encapsulating state data uploaded by the control unit and transmitting the state data to the master station.

4. An active on-line test controller for primary frequency regulation of a hydroelectric generating unit as claimed in any one of claims 1 to 3, characterized in that: The electrical quantity acquisition unit is used for acquiring PC / CT signals on a unit side, and converts alternating current and voltage signals into digital signals and transmits the digital signals to the control unit.

5. An active on-line test controller for primary frequency regulation of a hydroelectric generating unit according to any one of claims 1 to 3, characterized in that: The control unit comprises a state monitoring module, a data calculation module and a data storage module, the state monitoring module comprises an ARM and a peripheral circuit, and the state monitoring module is connected with the speed regulator interaction unit through a 485 bus.

6. The active on-line test controller for primary frequency regulation of a hydroelectric generating unit of claim 5, wherein: The data calculation module comprises a DSP and a peripheral circuit, and is connected with the master station interaction unit and the electrical quantity acquisition unit through an Ethernet bus and a 485 bus.

7. An active on-line test controller for primary frequency regulation of a hydroelectric generating unit as claimed in any one of claims 1 to 3, characterized in that: The speed regulator interaction unit comprises a data aggregation module, and the data aggregation module is connected with a switch quantity processing module and an analog quantity processing module; the data aggregation module comprises an ARM and a peripheral circuit, and is used for processing and packaging speed regulator interaction data.

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